Depending on the specific concern, I assume what mostly matters is where the facilities are, not who owns the company. (At least so long as it's an ally.)

it should be irrelevant who owns it. regulations ought to be robust enough anyway. technology export controls, worker protections (OSHA, business continuity, financial integrity, audits), market protection (no abuse of market power, ie. no dumping no Apple/platform/gatekeeper shenanigans, etc.)

Not yet. The federal government could still block it or the acquisition could fall through for other reasons.